alleryWhen solid sodium hydroxide is dissolved in water the temperature of the solution rises. This dissolution is therefore a/an:
Aendothermic process
Bdecomposition reaction
Cexothermic process
Ddisplacement reaction
Answer & Solution
Correct answer: C. exothermic process
1. A rise in temperature means heat is being given out to the surroundings.
2. A process that gives out heat is exothermic, so dissolving NaOH is exothermic.
3. If heat were absorbed the temperature would fall, which would be endothermic.
4. Dissolution is not a chemical reaction here; no new substance forms, so the decomposition and displacement options do not apply.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 3 "Chemical Reactions and Equations", p.48_
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